Wrong.
You have to provide proof of insurance to register a car, and if pulled over by the cops, you have to produce your license, registration and proof of insurance.
How would I know this?
Insuring Your Motor Vehicle
Maine law requires every owner and operator of a motor vehicle to maintain motor vehicle liability insurance and to present evidence upon request of a law enforcement officer.
Any vehicle you are operating must be insured even though you are not the owner.
Therefore, you should verify and carry evidence of insurance in the vehicle. Maine law also requires Maine motorists to show evidence of insurance when you register a motor vehicle. Acceptable forms of evidence of insurance include: a motor vehicle insurance card, a letter from an insurance company, or agent that the vehicle is covered by a liability insurance policy, an insurance binder or an insurance policy that has a summary document that describes the vehicle insured, the name of the insured, the amount of insurance (must meet Maine’s minimum liability requirements), the type of insurance coverage and the period the vehicle is covered (effective and expiration dates) to either the municipal agent or the Bureau of Motor Vehicles.
Failure to produce evidence of insurance when required can result in a charge of uninsured operation and suspension of license and registration privileges. If you are adjudicated of failure to produce evidence of insurance, you will be required to file proof of financial responsibility through an SR-22 insurance certificate or face suspension of your license and registration privileges.
If an uninsured motorist causes an injury or property damage of $1000 or more, they may not operate a vehicle until proof of financial responsibility or proper insurance have been shown. In addition, if a court judgment is obtained, driving and registration privileges are suspended until such judgment is satisfied.